Feed-water-temperature regulator



Patented Jan. 4, 1927.

UNtT-ED' STATES PATENT orner..

BENJAMIN BROIDO, Ol' NEW YORK, N. Y., ASB IGNOR TO THE SUPERHEATER COMPANY,

N. Y., A CORPORATION OF DELAWARE.

OF NEW YORK,

FEED-WATER-TEMPERATURE REGULATOR.

A applicati@ med october so, 192s. -smalr No. 671,811.

Thisd invention relates to economizers for heating the feed water supplied to steam boilers. With the use of such economizers it has been found that when the temperature of the feed water passing to the economizer falls below a certain point, the hot flue gases are unable to raise the temperature of the' p water within the economizer tubes to a point suilicient to prevent the formation of a condensate on the outside of said tubes. This condensate causes corrosion and pitting of the tubes and the consequent ra id deterioration of the economizer, whicli is much more serious with economizers constructed of steel than when they are constructed of cast iron. The tendency of modern steam @engineering is towards the use'of higher pressures, which necessitates the use of steel economizers to replace the cast iron economizers, almost universally used heretofore, therefore the prevention of the formation of the condensate becomes of very great importance.l A further difficulty caused by the presence of the condensate is the collection or absorption by the condensed water of soot and fumes from the iiue gases which causes a deposit to collect upon the tubes, thereby lowering the eiliciency of the economizer.

The .principal olect of the resent invention is to provi e a new an improved construction of great simplicity by means of which the" feed water delivered to the economizer will be raised to the temperature yrequired to prevent the formation of the aforementioned condensate..

Another object is to provide a means for automatically rendering the device operative or inoperative when the temperature of the feed water passing to the economizer falls below or exceeds respectively a certain critical point necessary to insure a temperature of the water within the tubes above which no condensate can be formed. Y

For the accomplishment ofthese and such 'further objectsas will be apparent to those skilled in the art to which this invention appertains, my invention consists in the con-y struction, combination and arrangement of parts, an embodiment of which is herelnl after more specically set forth and is shown in the accompanying drawing forming a part hereof, but it will be understood that changes, variations and modifications may be resorted to without departing from the spirit of my invention.

Fig. 1 of the drawing represents a diagrammatic showing of an economizer having a system of piping connected therewith for carryin out my invention, and Fig. 2 is an enlarge sectional detail.

Referring to the drawing, the numeral 10 indicates an economizer located, in accordance with the usual practice, within the path of the flue gases from the' boiler v12 and having the usual feed water tubes 11 therein.

The feed water is supplied'to the economizer from the hot well 13 by means of a feed water pump 14 having its suction side connected to the hot well by means of the pi e 15 and its pressure side connected to t e inlet of the economizer by means of the inlet pipe 16. The feed water passes from the outlet of the economizer to the boiler by the outlet pipes 17 in the usual manner.

. A by-pass 18, which is connected with the outlet pipe 17 and with the pipe 15 on the suction side of the a portion of the heated water passing from the economizer and to mix said portion with the colder water drawn from the hot well, thereby causing the temperature ofthe feed water passing to the economizer to be raised to the required point.

A thermostat 19, of an suitable construction is interposed in 'te pipe 16 and .suitable connections 20 are made from the thermostat to a valve 21, interposed in the by-pass 18, to cause said valve to be opened or closed when the temperature of the feed water passing throughpipe 16 falls below or above a certain predetermined point, thus causing the by-pa 18 to be placed automatically 1n operation.

Because of the frictional losses due to the passage of the water through the economizer tubes the pressure of the water at the exit ofthe economizer is less than at the inlet thereof, consequently it is necessary to connect the bypass the pump to insure vthe pamage of the hoi' l-water through said, by-pass.

The operatlon of the device is as follows: Assuming that the feed water being pumped from the hot well dro s below a certain critical temperature, or example 140, and that the thermostat 19 is set to open valve 21 at such temperature, a portion of pump, serves to deflect 18 toV the lsuction side ofl lll the hot water issuing from the economizer will be drawn through the by-pass 18 to mingle with the cold water passing through pipe 15, thereby causing its temperature to e raised to a suflicient degree to insure a temperature within the economizer which will preventthe formation of a condensate on the tubes thereof. If the feed water is above the critical temperature, valve 21 will be closed by the thermostat and no water will iow throu h by-pass 18. The capacity of the by-pass o viously should be so proportioned as to insure the passage of. a sufficient volume of hot water to raise the temperature 0f the water passing through the pump 14 to the required degree.

I claim:

1. The combination Withan economizer having a feed water inlet and a feed water f outlet and a feed water pump, connected withY said inlet of a byass directly connected with the outlet of t e economier and the suction side of the pump to cause a portion of the hot water issuing from the economizer toA be withdrawn bv the suction of said pump and mixed with the feed water flowing to said pump, a valve for controllin the'flow of water through said by-pass, an a heat-responsive device associated with the pipe line between the economizer and the by-pass controlling the operation of said valve. t

2. The combination 4with an economizer having a feed water inlet and a feed water outlet and a feed water pum connected with said inlet, of a b -pass 'rectly connected with the outlet o the economizer and the suction side of the pump to cause a portion of the hot water issuing from the econo- .mizer to be' withdrawn by the suction of outlet, and a pump connected with said feed water inlet4 to su ply feed water thereto;

of a by-pass direct y connected with the outlet of said economizer and the suction sidev of said pumpk to cause a portion of theq hot Water issuing from said economizer to be withdrawn by thesuction of said pump and mixed with the feed water owingto said pump, a valve within said by-pass and a thermostat interposed between said pump and inlet in the path of the feed water Howing to said inlet and connections fromsaid thermostat to said valve to cause said valve to be operated in res the temperature of t e feed water passing to said economizer above or below a certain predetermined critical oint.

- BEN AMIN BROIDO.

nse to variations of 

